| Acronym | Definition |
|---|
| OCI | Organisation de la Conférence Islamique (French: Organization of the Islamic Conference) |
| OCI | Office of the Commissioner of Insurance |
| OCI | On-Campus Interview (various universities) |
| OCI | Ontario Cancer Institute (Canada) |
| OCI | Oil Change Interval (engine maintenance) |
| OCI | Object Computing, Inc. |
| OCI | Open Catalog Interface (Sap Software) |
| OCI | Office of Commissioner of Insurance |
| OCI | Office of Criminal Investigation |
| OCI | Organizzazione della Conferenza Islamica (Italian: Organization of the Islamic Conference) |
| OCI | Open Constitution Initiative (China) |
| OCI | Old College Inn (restaurant, Knoxville, Tennessee) |
| OCI | Organisational Culture Inventory |
| OCI | Ocean Color Imager |
| OCI | Object Code Insertion |
| OCI | Overseas Council International (ministry program) |
| OCI | Office of Capital Improvements (various locations) |
| OCI | Opportunity Center Inc. |
| OCI | Options & Choices, Inc. |
| OCI | Operations Concepts, Inc. |
| OCI | Optical Channel Interface |
| OCI | Open Circuit Interval |
| OCI | Out of City Indicator |
| OCI | Orientation Contrast Imaging |
| OCI | Office of the Correctional Investigator of Canada |
| OCI | Open Control Interface (database publishing schema) |
| OCI | Offensive Counter Information |
| OCI | Oxford Cancer Information |
| OCI | Observable Critical Item |
| OCI | Oxide Control and Indication |
| OCI | Online Curve Interpolator (function of CNC to reproduce free-from contours) |
| OCI | Overall Channel Inversion |
| OCI | Oxygen Concentration Indicator |
| OCI | Office of Corollary Interest |
| OCI | Optically Coupled Isolator |
| OCI | Optical Cable Interface |
| OCI | Obstacle Course Instructor |
| OCI | Open Circuit Interconnection (Nortel) |
| OCI | Open Computing Infrastructure (OSF) |
| OCI | Open Collector Interface (Opticom) |
| OCI | Open Cable Initiative |
| OCI | Overseas Connections, Inc. |
| OCI | Onderwijs Commissie Informatica (Education Committee for Computer Science, Delft University of Technology) |
| OCI | Office of Central Inspection (Wichita, KS) |
| OCI | Optimum Choice, Inc. |
| OCI | Operating Companies Income |
| OCI | Outstanding Corporate Innovator (award) |
| OCI | Oracle Call Interface |
| OCI | Oregon Correctional Institution |
| OCI | Organizational Conflict of Interest |
| OCI | Optical Connector Interface (Lucent) |
| OCI | Other Comprehensive Income |
| OCI | Overseas Citizenship of India |
| OCI | Outlet Centres International (UK) |
| OCI | Online Commercial Intent/Intention |